Machine for threading pipes.



N0. 841,396. PATENTED JAN. 15, 1907'. P. W. HOEFER.

MACHINE POR THREADING PIPES.

APPLIoATIoN FILED ocT.14,1905.

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No. 841,396. PATENTED JAN. 15, 1907. P. W. HOHER.

MACHINE P011 THREADING PIPES.

APPLICATION FILED 0611411905.

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No. 841,396. PATENTED JAN. 15, 1907., F. W. HOEPER.

MACHINE POR THREADING PIPES.

APPLIGATION FILED OCT. 14, 1905.

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UNITED sTAjrEs PATENT onirica.

FREDERICK W. HOEFER, OF FREEPORT, ILLINOIS, ASSIGNOR TO HOEFERMANUFACTURING COMPANY, OF FREEPORT, ILLINOIS. I

MACHINE FOR THREADING PIPES.

Specification of Letters Patent.

Patented Jan. 15, 1907. 0

[Application filed October 14, 1905. Serial No. 282,850.

To all whom it may concern:

Be it known that I, FREDERICKW. HOEFER, a citizen of the United Statesof America, residing at Freeport, in the county of/St'ephenson and Stateof Illinois, have invented certain new and useful Improvements inMachines for Threading Pipes, of which the following is a specification.

This invention relates to a machine for exteriorly threading pipes androds. Its object is to produce such a machine that will cut threadsincreasing indiameter as they extend inward from the end of the pipe,

' thereby leaving the end portion of the pipe after it is threadedtapering toward its threaded end; and it consists of certain new anduseful features of construction and conibinations of parts speciallydevised to that end, all as hereinafter fully described, andspeciiically pointed out in the claims appended hereto.

Referring to the accompanying drawings, which form a part of thisspecification, Figure l is a face or front end elevation of a machineembodying my invention. Fig. 2 is a section at the dotted line 2 2 inFig. 1 of parts there shown. Fig. 3 is a section at the dotted line 3 3in Fig. 2 of parts there shown. Fig. 4 is a section at the dotted line 44 in Fig. 2 of parts there shown. Fig. 5 is a section broken from themachine and showing certain parts in detail. Fig. 6 is a section at thedotted line 6 in Fig. 2 of parts there shown. Fig. 7 is one of thethreading-dies of the machine. Fig. 8 is a sectional detail .of theInachine, showing the wrench for rotating the cani disk thereofoperatively connected therewith. Fig. 9' is a wrench for rotating thecam-disk of the machine to radially adjust its dies preparatory tocutting threads on pipes of different diameter. Fig. 10 is adiagrammatic view illustrating the operation of the dies ofthe machineand indicating in a general way the taper of a thread cut on a pipethereby.

Like letters of reference indicate corresponding parts throughout theseveral views.

A is a pipe held firmly clamped in a steamitters vise (not shown) or byother suitable clamping means.

B is the machine-frame, provided with an interiorly-threadedcentrally-located circular bearing B' and a preferably circular apertureB2, concentric with the bearing B and located at the rear portion of theframe. The frame B is formed, preferably, integrally by casting.

B3 is a collar adapted exteriorly to enter and Vfit the interior of theaperture B2 in the frane B and provided with a boreB* of any desiredcaliber, according to the size of the pipe to be threaded.

Bi is a set-screw, any desired nuinber of which m ay be employed torigidly clamp the frame B to the pipe to be threaded.

C is a peripherally-toothed die-head having radial die-recesses Ctherein and provided with a sleeve-hub C2, threaded exteriorly tocorrespond with the interiorlythreaded bearing B and bored at C3 toadmit therethrough the pipe to be threaded.

D is a peripherally-toothed disk, in this instance of less diameter thanthe die-head C, having a spiral cam-groove D" in the outer facethereofand rotatably and concentrically mountedpn the annular flange D2on the hub C2 of the die-head C. The disk D will be hereinafter referredt'o as a cam-disk for brevity.

D3 is a ring, threaded interiorly and turned onto the threaded portionof the sleeve-hub C2 until it abuts the annular ange D? thereon, wheretoit is secured by means of a screw D4. The ring D3 and shoulder D5, Fig.2, on the die-head C, while leaving the cam-disk free to rotate'on itsbearlng, jointly cause the cam-disk to participate in all movements ofthe die-head C toward and from its bearing B.

E represents threading-dies, housed and longitudinally slidable in therecesses C in the die-head C and provided with actuatinglugs E,projecting therefrom into engage# ment with the spiral groove D in thecarndisk D.

F represents plates for slidably maintaining the dies E in theirrecesses C inthe diehead C.

.G is a shaft mounted in bearings G in the machine-frame B.

H is a pinion meshing with the toothed periphery of the die-head C andsplined on the shaft G and provided with a laterally-extending sleeve H.

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I is a pinion, in the present embodiment of prefer lto rigidly securethe pinion I to thesleeve H of the pinion H by means of a setscrew I sothat it may be readily disengaged from the cam-disk D in order that thelatter may be rotated to radiallyadj ust the dies to any particulardiameter of pipe to be threaded. The pinion I has more teeth than pinionH, ano therefore rotatesthe cam-disk faster than pinion H rotates thedie-'head C.

such disk-D, its stud K being inserted be-` tween any two teeth thereofand its curved lip K2 contacting the inner surface oi" the pe ripheralflange of the same. l

A suitable handle, (not shown,) having a transverse rectangular sockettherein to admit the squared outer end of the shaft G, is employed tooperate the machine.

It will be seen that the dilerence in the speed of rotation of thedie-head C and the cam-disk D results in relative movement between saiddie-head and said cam-disk, which relative movement causes a radialmovement of the threading-dies E as said die-head and said cam-diskadvance simultaneously along the pipe being threaded. The scroll uponthe cam-disk Dis-wound in the direction to cause anoutward or separatingmovement of the threading-dies during the cutting operation. Theoperation of the dies E just described will be clearly understood froman inspection of Fig. 10 of the drawings.

L is a flat ring secured to the outer face of the die-head C to protectits teeth from dirt and other undesirable substances.

The operation of the machine is as follows: Any pipe A to be threaded isimmovably secured in a preferably horizontal position in the manneralready indicated. The pinion I is loosened and slid backward out ofengagement with the cam-disk D, and the wrench K is applied thereto andthe same is rotated thereby until the dies E are radially adjusted toadapt them to thread the pipe AA and the pinion I slid back into andsecured in mesh with the cam-disk D. Ii the pipe A is two and one-halfinches in diameter, the cam,- disk D should be rotated to the positionshown in Fig. 3, where the indicatore appears opposite correspondinggures marked thereon. Other numerals appear on the cam-disk D, and ifit'be rotated the requisite number of revolutions until any one thereofis opposite the indicator a the dies of the machine will be radiallyadjusted to correspond thereto. Supposing the pipe A to be two andone-'half inchesin diameter and the dies E to be adjusted as indicatedin Fig. 3, the shaft C will then be rotated and motion therebycommunicated through the pinions II I to the die-head C and cam-disk I),both of which as they are rotated will be drawn by the joint operationof the threads on the hub C2 and within the bearing B toward the latter,the dies E meanwhile being driven by their head C to cut a thread on thepipe A and4 simultaneously and gradually slid outward by their cam-diskD to increase the diameter of the thread, as indicated in Fig. 10. Aftera thread of vthe requisite length has been cut the die-head C is rotatedin the opposite direction until the dies disengage from the thread onthe pipe, when the set-screws B5 maybe loosened and the machinedisengaged 'from the pipe.

Having fully described-my invention, what- I claim asnew, and desire toVsecure by Letters Patent, is

1. In a machine for threading pipes, in

combination, a peripherally-toothed diehead provided withthreading-dies; a peripherally-toothed scroll cam-disk engaging saidthreading-dies, said cam-disk and'said die-head having a differentnumber of teeth; a'drive-sliaft; a pinion on said shaftfor saiddie-head; and a pinion on said shaft for said cam-disk, said pinionsbeing proportioned to rotate the die-head and scroll at differentspeeds.

2. In a machine for threadin combination, a frame; a die-hea rotatablymounted in said frame and arranged to travel therein; threading-dies forsaid die-head; a scroll cam-disk mounted concentrically with saiddie-head and arranged to travel therewith, said cam-disk engaging saidthreading; dies ,Zand means for rotat' said die-head and cam-disksimultaneous y at different speeds and in the same direction for givingthem a traveling movement in said frame.

3. In a machine for threading pipes, in

combination, a frame provided with an interiorly-threaded bearing; adie-head provided with threading-dies and with a sleevehub threadedexteriorly to correspond with the interiorly-threaded bearing intheframe; a scroll cam-disk rotatably mounted on the hub of the die-headconcentrically therewith and engaging said threading-dies and means forrotating said die-head and camfdisk simultaneously at different speedsand the same-direction. i

In 'testimony whereof I have signed my pipes, in

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name to this specification in the presence of.'

two subscribing witnesses.

FREDERICK W. HOEFER. Witnesses: A. HOEFER, JEssIE V. GHARET.

